Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7707864 | International Journal of Hydrogen Energy | 2018 | 6 Pages |
Abstract
The motivation of this work is the hydrogen production as a non-polluting renewable energy under visible light. For this purpose, the hetero-junction 2%MnO2/SiO2 was synthetized by the impregnation method and characterized by X-ray diffraction, scanning electron microcopy (MEB), FTIR spectroscopy, diffuse reflectance and electrical conductivity. The X-ray analysis shows the amorphous silica substrate and the rutile phase MnO2. The optical curve (αhν)2 as a function of hν shows a direct transition of 1.83 eV for MnO2. The capacitance measurement of the rutile indicates a flat band potential of â0.027 VSCE, more negative than the hydrogen evolution in SO32â aqueous solution. As application, hydrogen was successfully evolved over the hetero-junction MnO2/SiO2. A good H2 production was obtained after 30 min of irradiation corresponding to 5.1 mmol hâ1 gâ1 under visible light (29 mWcmâ2). The improved photocatalytic performance is due to the sensitizer MnO2 homogeneously supported on porous SiO2 substrate acting as templating agent.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
A. Belhadi, L. Boudjellal, S. Boumaza, M. Trari,